If my editor has to buy InCopy, why do I have a version of it in my Adobe CC account?

I’m basically asking why do I (a designer that uses InDesign) have Adobe InCopy if I won’t use it. I use InDesign. The answer I keep getting online is that Adobe InCopy is used so that my editor can edit my InDesign files. But I can’t share my copy of InCopy with my editor, correct? She’ll need to buy her own copy of InCopy. So what’s the point of giving it to me then in Adobe CC? It’s of no use to me, correct? Or am I missing something?